不同生育时期青贮玉米主要性状变化规律的研究

为了研究青贮玉米在不同生育时期产量和品质的变化规律,获取高产、优质青贮玉米,于抽雄期、抽雄后10,20,30,40,50和60 d分别测定了北农青贮208和中北青贮410的干物质含量、生物产量、生物鲜重、中型洗涤纤维(NDF)含量、酸性洗涤纤维(ADF)含量和粗蛋白(CP)含量。结果表明:1)从抽雄期到抽雄后60 d,含水量不断下降,干物质含量不断上升。2)从抽雄期到抽雄后40 d,生物产量迅速增加,40～60d,变化不大。3)从抽雄期到抽雄后20 d,生物鲜重不断增加,在抽雄后20 d达到最大,随后逐渐下降。4)从抽雄期到抽雄后20 d,NDF和ADF含量较高;从抽雄后20～30 d,NDF和ADF含量显著下降;30～60 d变化不大。5)粗蛋白含量在抽雄期最高,从抽雄期到抽雄后30 d,呈下降趋势;30～60 d变化不大。6)不同生育期的青贮玉米杂交种具有不同的最佳收获期,北农青贮208的最佳收获期是在抽雄后35～40 d,中北青贮410的最佳收获期是在抽雄后40～50 d。

Changes of Main Traits of Silage Corn in Different Developmental Stage

In order to study the changes of yield and quality of silage corn in different developmental stage,the dry matter content,dry matter yield,crude yield,NDF content,ADF content and CP content of BeiNong208 and ZhongBei 410 were surveyed at the stage of tassel,10,20,30,40,50 and 60 days after tassel.The results showed that:1) The water content decreased or the dry matter content increased gradually from the stage of tassel to 60 day after tassel.2) The DM yield increased rapidly from the stage of tassel to 40 day after tassel,and changed less from 40 day to 60 day after tassel.3)Crude yield increased from the stage of tassel to 20 day after tassel,and decreased then.4) The NDF and ADF content were higher from the Stage of tassel to 20 day after tassel,then decreased significantly from 20 to 30 day after tassel,and changed less from 30 day to 60 day after tassel.5) The crude protein were highest at the stage of tassel,decreased then from the stage of tassel to 30 day,and changed less from 30 day to 60 day after tassel.6) The silage corn hybrids with different growth period had different harvesting stage.The best harvesting stage of BeiNong208 was 35~40 day after tassel and 40~50 day after for ZhongBei410 tassel.